Port Alsworth, Alaska in the context of Lake Clark National Park and Preserve

Lake and Peninsula Borough (Russian: Лейк-энд-Пенинсула, Leyk-end-Peninsula) is a borough in the state of Alaska. As of the 2020 census, the population was 1,476, down from 1,631 in 2010. The borough seat of King Salmon is located in neighboring Bristol Bay Borough, although is not the seat of that borough. The most populous community in the borough is the census-designated place of Port Alsworth. With an average of 0.017 inhabitants per square kilometre (0.044 inhabitants/sq mi), the Lake and Peninsula Borough is the least densely populated organized county-equivalent in the United States; only the unorganized Yukon-Koyukuk Census Area has a lower density.

Lake and Peninsula Borough is a borough in the state of Alaska. As of the 2020 census, the population was 1,476, down from 1,631 in 2010. The borough seat of King Salmon is located in neighboring Bristol Bay Borough, although is not the seat of that borough. The most populous community in the borough is the census-designated place of Port Alsworth. With an average of 0.017 inhabitants per square kilometre (0.044 inhabitants/mi), the Lake and Peninsula Borough is the least densely populated organized county-equivalent in the United States; only the unorganized Yukon-Koyukuk Census Area has a lower density.